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Keywords:

  • B[BOND]C bond formation;
  • carbonyl–borylene coupling;
  • heterocoupling;
  • reversible intramolecular ligand coupling;
  • borylene complexes
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Cyclic complex 2 with bridging carbonyl ligands was synthesized from a facile and reversible intermolecular carbonyl–borylene ligand coupling reaction at room temperature. Complex 2 exhibits an unprecedented coordination mode for boron–metal complexes, which is also reflected in its remarkable 11B NMR chemical shift of −57.2 ppm. Findings from spectroscopic, X-ray, and computational studies are presented, along with a proposed mechanism.